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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1edb008552ecc035d25e94e10447db8fd5c6c10dd597101e898f3e7d99345d5' 
  AND token = 'fPMa45xTkI/hrcjngqvh9fn/Z0xlpb/jORsFyiCg4HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}