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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4687abe81af71911a60e7dda833358906d5cb3616c54a47039d94b4e09fca61e' 
  AND token = 'exGbyZdp6cPsg+sTGigtFb90RKIlEF/tvZ+pcfsWcrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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