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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01207003c76a1aeda989ff00cf915e7459252e7bdfcb6c33089c515bf233d4d' 
  AND token = 'n3IqCtyPh28Few3neure51xp5iyri4TdArXSG6ag9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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