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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52d6ab3011d5fcbc3113dcb5727bab233f31b9485ea4fb01c42836b236c6b5c' 
  AND token = 'lkshwzAdhNUKXLeoSFfkPmzs1DozRqN12nMI3LbQR0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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