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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e15305b80605e476bd6577c180fecc86ce34b07ebf51e5929a6e044be2ba50e' 
  AND token = 'hxDCmILrE82Mrk98DZUN/XqDsH8y1GMcEgRhoJRQluc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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