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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65299bd6cf84cf1bd6591503851bfc152b480e4f70f4341f5c378138d52f64d' 
  AND token = 've7GRdZoljAT1CRCR5iMmHCkiawN2Srw/lR1Il46Wzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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