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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b1f614c99a006dbeac3609d10c8cf025ce25f172ea164e28622d18aecd50e7' 
  AND token = 'EdkpIhPg3X3jABNdGH3VjhRRnh0tOBZlOj2ObTfJGHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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