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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8725ee1c554eccae861a203d015e0fb8511b29fdb2eea333622978817a4316fa' 
  AND token = 'J+8gh3vYjpal3JNkFi3D3988HJAiU9WY4tLtm6nzCg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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