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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2357dee8702a60c9fa381aebff3c46605d31d05970b92b5e604bb4b8b753003a' 
  AND token = 'qXR7dddTunSoev2PYbHJeaIGrvDyzWTkKr2vNE7FR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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