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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4aef7d92177bb04a092f7734c6dfb3475e84e1b299f7ac5a0c236d6f4a460f' 
  AND token = 'x1agsSWV7X/00sPslc8mpjpA+7FfUOgKkE2cPZwDdv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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