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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad325f9ed44753af93a2ec065e55ff595c189d5673c2a8ff4c031e9a01bae3b4' 
  AND token = 'yFqjR/7y7bjRIbc1BD+3TqbmkRxzlmic0oDVGlFvels=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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