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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2c9d0051b0f092cc484f472210b58764f17f48c0ad242ae68288a701329a5c' 
  AND token = '0Q7vcOzcfUztjg5JWJiQ7nzQbvf8U+zaSPjp1IcEPR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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