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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f77b7eecf252972b3f46c255f8a524cde2fe4511025e34a13c6e0c17355fbe' 
  AND token = 'p/NjDkYjJms11JLC0mJirA82O4D6+vZmdHHkoPV/dss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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