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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859d9a2756071eddf89e1a92b326fad7f10a1b0c007fa55f1322c28b4aa03780' 
  AND token = 'b0edepbw6IC9y8iM64ODZC4uVvNu3X1LX0eV/YtTKMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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