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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb9fe9599e498b05e26b93f26cca10d84f6fe3e9a46e29f7f83fab64bde921b' 
  AND token = 'EGG0icB2tR1Fq5TrLNdcb2CjfAke3zmiRKO6r+uEkiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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