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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243f0d0604b458eb6b9681a94074efe37c2080b7b88c6fcf54f567abefae099c' 
  AND token = 'MZTIrhxrL7AsFoYwU86seUr873sA+kksrlo62OMp8d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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