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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b61276f4bb97ea5c3a832c636e73b9e98c117866e71b8a91bd45acbf7fcbc7b' 
  AND token = '2XGYWYZqacKho5LziBLkMbwiZHXk3b8z5lPNPMWgSuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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