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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf12c8da8e85147ebcce3c2a414b00dc0d6dcef00b103f5d7034bc2c2b5134d2' 
  AND token = 'KiXcYWBmSfjvc/vQySplQVSW5MsM9E/c7a7WKguTNqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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