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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac56afa6e475cbad7c5650dd02323c9567ac08ad74c01e6877ad22d762492191' 
  AND token = 'opXQnSkpIIOWHC92Et7Pt9M5kS1NKHF19JTIq4lOl30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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