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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273bc803f4d3d728065772aea5c0b43b7b4e7b64ee1a0c8ea2e0f8d06ba7089b' 
  AND token = 'jbUtEADDkTyridGYcrRWGVu10Yb5tbXHCmON2lZl/hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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