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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e0cf0ac01aa41e13868fe32ecdbf5cc523ab2ad1ceab81ffc35c4c7a8b37ad' 
  AND token = 'I8XATEjyCG2MOMvG+G97Of5KVyx3kJlHlQmB6eTpNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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