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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5a7383020664a1c6112859202ebeb89686749c7aa807f99a5fd7e06f0c0da9' 
  AND token = 'qd92VUAZ053EmYMM9ZfAL1gsLVyxfWPedM9l+rLY6u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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