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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd60d2025a34b93dbbd5554492a0c15b20e552e271c1992d29635aeac92cf873' 
  AND token = '2LiYfv1YL0aDozL01NR7LGhhpGsSWDuoJN6arULV4zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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