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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffabd638a481ed10994b37bc04a681f7d100d4c7348801df5902536e95bd3c8' 
  AND token = 'G8LGGhjh9L5/0ZAVhU4ZFRD93IV7AHm/UWhP2q6INDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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