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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7f77cc2a0257fbb4e7c6164036bdb3e4e64ace5c89cb8d911c2c75dc926588' 
  AND token = 'OAQjF1O4ztGXmmdrwmwncwsX06QVsJ+S7o5wIFlEDxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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