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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e485b952d3f3cdf8b1c73e66aebc70c6b83f6b989718a64ed801dabf6a5132fa' 
  AND token = 'nJ80W/b0IzEiH8ZcGC9MJ6iakEzdp0CMc6IaN6b/YRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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