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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c8beb60c3d70b786be7dd4d28f869d2cd5b1c37396de925bee4e78472b7ef1' 
  AND token = 'QxwEQs1p9auiszpTF/vqQsirVLaCNTiT7dEObjxrqmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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