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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d189acd1fa76ad47a54f22607f44b6c7c872a657037a1aa0d6eff84e3ecd340' 
  AND token = 'S71kndNgG/ttk1CdwuhGIckJFN/UJRhTEX481ULGCE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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