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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b042e0e23acb9d1093d5793fcf0555d7dc168a2cd7f6e5bd8d5397a1cd62115f' 
  AND token = 'CcM18Bd3MCFz2uvyJ0C1EhKYWjOplRlOfudGg+dVdTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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