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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7dd529c030e58f37276ed05bd6c7880ecdcb8c0a0e2f46ca20a0b7b18062b3' 
  AND token = 'Oqicu+rG0xna2LWbgRrEXLD/7cdpz/PpdHvKQLt3Gic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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