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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddd61e6e080c5b7036a56fb8e856517cb46ad0168ed71dd6d171cc203005c62' 
  AND token = 'Z6/Gm0qhdUcN+omWlPeCKXNtsmLw2U42Al/iYpkOrQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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