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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db634046006f3d8601e81ca8fe8a594154f848402970c25aa9e0c7804669d17b' 
  AND token = '7XA7dS32rXZOrTlJXAokLw/kA4tzhG4vDTPDxj2h0MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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