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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfc720bb0e83b867f11c6deca1d8b276b9c2d9052b0aab9e783a12bdcd3a4b3' 
  AND token = 'rg/huSpHAwt1ha9boT4Qp+RYaH87ew+j/00NUuCwsTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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