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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b38bf9b8a44d5722a2eedfce3f284281970b425dc8803a2add2d9d41864e34' 
  AND token = 'uevJhKfjSdNpag4yaVmdObfbqYVpDB2Mv3pULxbIFxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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