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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bef27223769dafea0e70a9c2879203950d1ac7aac352395e66079b3de42318' 
  AND token = 'HzOZ6ayhcq0hQICi60atQQ//Ixjfl5FQx3R2u3SIqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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