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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e5124809973165cbc867873e829b7add8a14f1c5a253e2f711b03d5d61a41f' 
  AND token = '5ElA1jkKxcbD46264Z7BNcuC8B2yv2Vm1Q50z/s5CCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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