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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ed43a9df5c6e9c7840927c7c5134198d9665433a85135e35cdb051d3b323df' 
  AND token = 'Ik2N+CZ38LuxU4qSLpAGFYF8tuQGT0dQHfo+SfqCdtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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