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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78bda9809c0190218c560a8413bc5aeeb167d46de03fc54b0bd15dc6d2bfe69' 
  AND token = '23LiN3VCAwCD2qrRIOgY+g21ysN1U+Zq6gYZz6GzZIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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