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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f28e0ef2148e5c51c329e996a22aaa565a4357170b1732ebbb969b8bd8d893a' 
  AND token = 'P8I33yEqzmohl2t82oC8v69Rr9zcyRS+RMDmxFjEIk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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