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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611f0dc5ca3cf30328d820c6f735e1bc528ef32f1df5ceab9db05a2b8a59f580' 
  AND token = 'swHojMm92abDSZR37Sg3ntWfcG0UTwG0ZF8l0RHSmh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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