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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4764493e88095f906e7eca52edd88ac6143b42439dc03fb23eac279e8c2a2f96' 
  AND token = '3AgI33B+x3Ge2795K5CpPvIvDrYGfPQAtZAWvqcC5d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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