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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fb182b6a2cd3dc9e332c5764496ad8ed49edeaf5bb4b78662cb4e0b5c62324' 
  AND token = 'P7uKeDqMoOPTbMmSKOBugvaz4XxEw9r3UBtNJkZcCJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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