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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7205724ad02e9949de961d3e5b0a47b989392242a81690601c4e7b42856c4b92' 
  AND token = 'gvCp9blj5Uu9I9ogi5aZvEysinBDuX+2859CWLd0Y30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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