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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8461cd7f285c197ef19d6aa47d31a16759a12c9c99a4a790fe1ef096918d3eb7' 
  AND token = 'MDAS2Fsa86kJscJPOO2W4Qa4qqMOqy8z2iNBB6vEaL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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