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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7c68b0709c50a505c4bc509c47006754616e24ac6fc8344b7701c2840eb584' 
  AND token = 'nJddqGluNcKNTzW7f+l+VGSEof4cOEzUcXL9dWnrLmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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