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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8253eef7dc3d8a33798e60fe079838afc96526808aef822bd4021b117bd29e2e' 
  AND token = 'laM5WAaZ8CZhZV8bxsf5V2l2GGkO+5pw6mmFDTXQqhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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