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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae687d2f5991aa73eba07872a2d40843dfdc068477b12a779dadd0c90bf10882' 
  AND token = 'bn9GMUgccA78wbLkf0h1FI1lXcKuoUPO3RKQ019D+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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